Register to reply

Pressure in a Tank

by eskimogenius
Tags: pressure, tank
Share this thread:
eskimogenius
#1
Mar25-14, 09:58 PM
P: 3
Hi all, I need some help with this question.



The final answer is 32.7kN but I have no idea what I'm doing cause I'm so lost in this fluid mechanics class right now.

I attempted to calculate the pressure on the plate.

P = pgh
P = 1000*9.8*2
P = 19600 Pa

Then I used F = P.A to get 78400N. I know this question has something to do with torque and resolving forces but I'm pretty sure I've already got it wrong. My lecturer provided me with this equation:

y' = y + I_c/(y*A) and I_c is BH^3/12.

Will I need to use this as well?

Thanks in advance. :/
Phys.Org News Partner Science news on Phys.org
Apple to unveil 'iWatch' on September 9
NASA deep-space rocket, SLS, to launch in 2018
Study examines 13,000-year-old nanodiamonds from multiple locations across three continents
paisiello2
#2
Mar26-14, 12:52 AM
P: 558
Your value for P is not correct. I would calculate the value of P at different points to see why this is the case.
eskimogenius
#3
Mar26-14, 02:02 AM
P: 3
Thank you for your reply. I've finally worked it out.

Using that y' equation, I worked out the location off y' and then determined the amount of torque it placed on the hinge. That then equates to 2*F and after a simple rearragement, I solved the question as we just needed to make F the subject.

The value of H is actually 1.5m as I was meant to be looking at the centroid.

Thanks for the tip :)


Register to reply

Related Discussions
Pressure in a tank. Introductory Physics Homework 10
Easy Tank Model? Outflow of tank proportional to volume of tank. Engineering, Comp Sci, & Technology Homework 8
Pressure in cylindrical tank Engineering, Comp Sci, & Technology Homework 0
Pressure in a certain tank is 55.8 Pa Engineering, Comp Sci, & Technology Homework 6
Pressure in a tank General Physics 1